Collects only the immediately enclosed objects of a graph (i.e., not
recursively) to form an iterator. The Graph itself is not included. Can
simulate DeepIterator by recursively calling itself for every nested graph.
If there are no nested contexts, then works identically to DeepIterator.
Harry S. Delugach ( email@example.com ) Copyright (c) 1998-2020 by
Harry S. Delugach.